| Castellana Grotte to Novi di Modena | 420.93 mi (677.43 km) |
| Castellana Grotte to Novi Ligure | 501.72 mi (807.45 km) |
| Castellana Grotte to Nuoro | 412.66 mi (664.12 km) |
| Castellana Grotte to Occhiobello | 397.01 mi (638.93 km) |
| Castellana Grotte to Oderzo | 411.76 mi (662.66 km) |
| Castellana Grotte to Oggiono | 518.16 mi (833.89 km) |
| Castellana Grotte to Olbia | 400.27 mi (644.17 km) |
| Castellana Grotte to Oleggio | 538.65 mi (866.87 km) |
| Castellana Grotte to Olgiate Comasco | 532.86 mi (857.55 km) |
| Castellana Grotte to Olgiate Olona | 530.03 mi (853.01 km) |
| Castellana Grotte to Omegna | 558.55 mi (898.90 km) |
| Castellana Grotte to Opera | 506.89 mi (815.76 km) |
| Castellana Grotte to Oppeano | 429.03 mi (690.46 km) |
| Castellana Grotte to Orbassano | 563.71 mi (907.21 km) |
| Castellana Grotte to Orbetello | 325.52 mi (523.88 km) |
